Dalton Transactions
Paper
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606–610 [(L3)CoBr]+.
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Polymerization of 1,3-butadiene
In the glovebox, a known quantity of catalyst 1–3 (10 µmol)
was transferred into a Schlenk tube, to which chlorobenzene
(30 cm3) was added after removal from the glovebox. The
Schlenk tube was attached to a N2/vacuum double manifold,
and the solution was left stirring for ten minutes. To the solu-
tion, MAO (6.6 cm3 of a 10% solution in toluene) was added in
order to activate the catalyst. The solution was left stirring for
five minutes. 1,3-Butadiene gas was then passed through the
solution in the Schlenk tube. The polymerization was allowed
to proceed for 15 minutes, before being terminated by stop-
ping the 1,3-butadiene supply. The viscous solution so formed
was immediately poured into acidified methanol (20 mL conc.
HCl in 200 mL methanol) containing 2,6-di-tert-butyl-4-methyl-
phenol (1.0 wt%) as antioxidant, causing the polymer to pre-
cipitate. The mixture was left stirring overnight. The polymer
was filtered, washed with methanol and then dried under
vacuum for 12 hours.
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Dalton Trans., 2014, 43, 15727–15736 | 15735